supporting science, technology, and improved economic performance and financial literacy in the 21st century. >> and with the ongoing support of these institutions and foundations. and... >> this program was made possible by the corporation for public broadcasting. and by contributions to your pbs station from viewers like you. thank you. >> brown: algeria's state news agency now says special forces have completed a mission to rescue dozens of foreign hostages, including some americans. they'd been held by militants tied to al-qaeda. but there are wildly varying accounts of how many got out alive, and how many were killed. >> because of the fluidity and the fact that there is a lot of planning going on, i cannot give you any further details at this time about the current situation on the ground. >> brown: even this afternoon, as secretary of state hillary clinton suggested, the situation in algeria remained confused. the focus was this natural gas compound in the sahara desert seen here in footage from last month. the vast, natural gas facility at in amenas is owned in part by b.p. a